【摘要】 以四川盆地含膏盐(石膏、芒硝、钙芒硝)红层为例,论述了含膏盐红层的沉积环境及其分布范围,膏盐矿物在红层岩体中的分布及其矿物学特征,讨论了由于膏盐矿物溶蚀形成的有别于常规碳酸盐岩岩溶作用的红层类岩溶作用。依据水电工程实例,描述了红层坝基类岩溶形态,分析了类岩溶和溶蚀下限机理,同时给出了四川盆地几各水电工程类岩溶红层坝基的溶蚀下限深度,为确定坝基岩体防渗深度提出了相关地质依据。更多还原

【Abstract】 Taking the red bed containing saline deposit(gypsum,mirabilite,glauberite) in Sichuan Basin as the studying case,the depositional environment and the scope of the red beds containing saline deposits therein,as well as the distribution of the saline deposits within the rock masses of the red beds and their mineralogical features are expounded herein,and then,the pseudo-karst action resulted from the erosion of the saline deposits in the red beds that is different from the normal karst action of carbonate rock is discussed as well.Based on the actual cases of the construction of hydropower projects,the pseudo-karst morphologies of the rock masses of the red beds for the dam foundations are described along with the analyses made on the mechanism of the lower limits of both the pseudo-karst and the erosion,and furthermore,the lower limit erosion depths of the dam foundations consisting of the red beds with the pseudo-karst for several hydropower projects developed within Sichuan Basin are given at the same time,so as to provide the relevant geological bases for determining the anti-seepage depths for the rock masses of the dam foundations concerned.更多还原